stoxman wrote:I may have to go back to the one I photographed and watch them while it is playing.
Would you? I think that's a wonderful idea. One may be for the payout solenoid and tick about 3-5 times a second, the other may either tick quite fast (10 a second) for the main stepper or else be a long timer for the game period.
The three contacts, from the top down, will most likely be (1) break contact, (2) common of contact and heater and (3) heater. I would expect (1) to switch a solenoid or relay coil, (2) probably goes to power supply common, maybe through a relay contact, and (3) will need some kind of ballast, like another relay coil in series, as applying 50V otherwise will give it a brilliant but extremely short life. If possible, could you take a meter along and find out the resistances of whatever is in series with each heater?